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If alpha+beta+gamma=2pi then...

If `alpha+beta+gamma=2pi` then

A

`tan ""alpha /2 + tan ""beta / 2 + tan "" gamma/2= tan ""alpha /2 tan ""beta /2 tan ""gamma/ 2`

B

`tan ""alpha/2 + tan ""beta /2 + tan "" gamma /2 = tan "" alpha /2 tan ""beta/2 tan "" gamma/2`

C

`tan "" alpha /2 tan "" beta /2 + tan ""beta /2 tan "" gamma/2 + tan"" gamma /2 tan "" alpha /2 =1`

D

`tan alpha tan beta + tan beta tan gamma + tan gamma tan alpha =1`

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The correct Answer is:
A
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